You'll need to inspect the logs on your tester's device to find the cause of the crash. The console log may provide some help -- your tester can retrieve the console log by using the iPhone Configuration Utility that Apple provides. It can be downloaded from http://www.apple.com/support/iphone/enterprise for both OSX and Windows.
If your tester downloads and runs this, it will give him a view pretty similar to the Organizer window in Xcode. Have him click his device on the left-hand side, and then the "Console" tab, and then save the log and send it to you.
If your app is crashing on startup, you'll need to gather his crash logs and read those. There's a million ways an app could crash; we'd need a lot more information to help you diagnose the problem.
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